Black chalk

a mineral of a bluish color, of a slaty texture, and soiling the fingers when handled; a variety of argillaceous slate.

See also: Chalk

Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
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References in classic literature ?
They were willing and ready to retrace their steps, when, in crossing the suburb which leads to the gates of the town, upon a white wall which was at the corner of a street turning around the rampart, Athos cast his eyes upon a drawing in black chalk, which represented, with the awkwardness of a first attempt, two cavaliers riding furiously; one of them carried a roll of paper on which were written these words: "They are following us."
Chiefly executed in black chalk on rough 'oatmeal' paper, they seem to elide actual torrents witnessed with apocalyptic dreams.
Leonardo used ink made from oak galls and iron salts, which is transparent in infrared light, allowing his black chalk underdrawing to be seen for the first time.
Other highlights include a delicate sketch of The Head of Leda, from the Greek myth of Leda and the Swan; a charming drawing of oak leaves and acorns and a detailed black chalk and pen and ink study of the muscles of the upper spine.
People call me black-penned, but I don't write on the blackboard with black chalk; I use white chalk so that the blackness of the board becomes more evident.'
Mr Gaonakala said teachers and educators must make extra efforts to reorganise the classroom setup, advocating for the use of black chalk boards so that the contrast of the white chalk may enhance read-ability.
A new kid on the block is Black Chalk Wine which launched at the fair under the watchful eye of winemaker Jacob Leadley and his business partner Andrew Seden.
Yates, who was born in London and now lives in New York City, set his first novel, Black Chalk (2013), in his homeland.
Yates's cult hit Black Chalk introduced that rare writerly talent: a literary author who could create a plot with the intricacy of a brilliant mental puzzle, and with characters so absorbing that listeners are immediately gripped.
Here, Michelangelo works in black chalk with soft chiaroscuro that models the beautiful face.
His black chalk portrait of Quaratesi, who was 37 years his junior, as a somber dreamboat with plush lips and faraway eyes is an eye-stopper.